HP Placement Paper - Data Structure Questions And Answers

HP Previous Years Solved Sample Placement Papers

1. As compared to associative arrays, vector arrays are much
   

   a) Faster

   b) Slower

   c) Stable

   d) None of them

   Answer: a) Faster
2. Which function returns an array consisting of associative key/value pairs?
   

   a) count()

   b) array_count()

   c) array_count_values()

   d) count_values()

   Answer: c) array_count_values()
3. The updated MySQL extension released with PHP 5 is typically referred to as..
   

   a) MySQL

   b) mysql

   c) mysqli

   d) mysqly

   Answer: c) mysqli
4. Which one of the following statements is used to create a table?
   

   a) CREATE TABLE table_name (column_name column_type);

   b) CREATE table_name (column_type column_name);

   c) CREATE table_name (column_name column_type);

   d) CREATE TABLE table_name (column_type column_name);

   Answer: a) CREATE TABLE table_name (column_name column_type);
5. Which one of the following statements can be used to select the database?
   

   a) $mysqli=select_db('databasename');

   b) mysqli=select_db('databasename');

   c) mysqli->select_db('databasename');

   d) $mysqli->select_db('databasename');

   Answer: d) $mysqli->select_db('databasename');
6. Which of the methods are used to manage result sets using both associative and indexed arrays?
   

   a) get_array() and get_row()

   b) get_array() and get_column()

   c) fetch_array() and fetch_row()

   d) fetch_array() and fetch_column()

   Answer: c) fetch_array() and fetch_row()
7. Which two predefined variables are used to retrieve information from forms?
   

   a) $GET & $SET

   b) $_GET & $_SET

   c) $__GET & $__SET

   d) GET & SET

   Answer: b) $_GET & $_SET
8. When you use the $_GET variable to collect data, the data is visible to..
   

   a) none

   b) only you

   c) everyone

   d) selected few

   Answer: c) everyone
9. When you use the $_POST variable to collect data, the data is visible to..
   

   a) none

   b) only you

   c) everyone

   d) selected few

   Answer: b) only you
10. Which function is used to check whether a variable is an array or not?
    

    a) on_array()

    b) is_array()

    c) the_array()

    d) None

    Answer: b) is_array()
11. Which function adds a new element at the end of an array?
    

    a) push()

    b) pop()

    c) stack()

    d) None

    Answer: a) push()
12. Which function returns the last element of an array?
    

    a) push()

    b) pop()

    c) stack()

    d) None

    Answer: b) pop()